Veterinary instrument.



No. 787,594. PATENTED APR. 18, 1905.

H. M. STEVENSONQ VETERINARY INSTRUMENT.

APPLICATION FILED JUIIE14,1904.

5] a 1 man 01 flenryff. 920w ms'on Rhianna UNITED STATES Patented Aprilis, 1905.

PATENT OFFICE.

HENRY M. STEVENSON, OF PERRY, IOWA, ASSIGNOR OF ONE-HALF TO CLARENCE E.BEAVER, OF PERRY, IOWA.

VETERINARY INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 787,594, dated April18, 1905.

Application filed June 14, 1904. Serial No. 212.538.

To all whom it may concern:

Be it known that I, HENRY M. STEVENSON, a citizen of the United States,residing at Perry, in the county of Dallas and State of Iowa, haveinvented certain new and useful Improvements in Veterinary Instruments,of which the following is a specification.

This invention relates to improvements in that class of instrumentscommonly used in the practice of embryotomy; and the essential featureof the invention is comprised in the peculiar construction and mountingof the embryotome which is used in connection with the instrument,whereby same may be readily manipulated in the removal of the fetusbeing operated upon.

The majority of instruments of the class to which my invention relatesin dismembering' a fetus preparatory to its displacement from the bodyof the mother must be entirely removed from operative position in orderto adjust the embryotome, and this is the cause of no small amount ofinconvenience and loss of time, as will be readily apparent. It istherefore a desideratum that the embryotomy knife or hook, as the casemay be, should be susceptible of various adjustments as the same isbeing used and while within the body of the animal from which the fetusis being removed, and this is readily attained in the practicalembodiment of my invention.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanying drawings.

WVhile the essential and characteristic fea tures of the invention aresusceptible of modification, still the preferred embodiment of theinvention is illustrated in the accompanying drawings, in which Figure 1is a perspective view showing the pivoted knife mounted in operativeposition upon the instrument. Fig. 2 is a sectional view, the shankbeing broken away, showing the hook in position thereon. Fig. 3 is adetail perspective view of the head.

Corresponding and like parts are referred in all the views of thedrawings by the same reference characters.

The instrument herein described is especially adapted for use inoperating upon live stock and consists of the shank 1, provided at oneend with the handle 2 and at the other end with a tubular portion 3. Thetubular portion 3 is internally threaded, as at 4:, and a head 5 isadapted to be screwed into. the part 3, being also threaded at 6 forthis purpose. The head 5 is provided with a longitudinal slot 7, whichis open, as shown at 8, to admit of insertion of the shank of the hookor knife 11 therein. The shank 9 of the hook 10 is rigid, beingintegrally formed therewith, whereas the shank 9 of the knife 11pivotally supports the said knife. Apivotpin '12 attaches the knife 11to its shank 9, and the shanks of all the embryotomes are provided witha head 13 and an adjacent annular groove 14. The portion of the shankhaving the groove 14 is received in the slot 7 of the head 5 when theembryotome is in operative position thereon, making a swiveling orrevoluble connection.

The book 10 or knife 11 is held in position upon the shank 1 of theinstrument by the clamping action of the tubular portion 4 against theshank 9 or 9, and the portion 4: is adapted to be forced into engagementwith the shank 9 or 9 by a screwing movement of the same upon the head5. In screwing the shank 1 upon the head 5 the tubular portion 4 whenengaging the embryotome will cover the open portion 8 of the slot 7, andthus all likelihood of displacement of the hook or knife is obviated.

The hook 10 when attached to the head 5 is adapted to swivel thereon andmay be readily turned in the desired direction by a slight unscrewingmovement of the shank 1 to disengage same from'the shank 9. The bookfurther projects at an angle from the shank, and this is advantageous infacilitating the removal of the fetus. The knife 11, because of itspivotal mounting, is susceptible of many variations in adjustment, someof which are indicated in dotted lines.

In actual operation to adjust the embryotome when within the body of theanimal from which the fetus is being removed same is grasped in one handand the shank 1 is unscrewed by the other hand until the portion 4 isdisengaged from the shank 9 or 9. This done, the embryotome may beproperly adjusted, after which the. shank 1 is again screwed upon thehead 5 to rigidly hold the instrument parts in place. The arrangementand manner of attaching the instrument parts is also of great advantage,since same may be very quickly disassembled for cleaning purposes.

Having thus described the invention, what is claimed as new is 1. In aveterinary instrument, the combination of a main shank, a headadjustable upon said shank, and an embryotome movably mounted upon head.

2. In a veterinary instrument, the combination of the main shank, a headhaving adjustable threaded connection with said main shank, theembryotome movably mounted upon the head, said head being adapted to beadjusted to effect engagement of the shank with the embryotome.

3. In a veterinary instrument, the combination of a main shank, anembryotome comprising a shank revolubly mounted upon the 1 head receivedby said'tubular portion, and an 1 embryotome mounted upon said head, theshank cooperating with the embryotome to hold same in position.

5. In a veterinary instrument, the combination of a main shank providedat one end with a handle and at the other end with a tubular portion, ahead threaded into the tubular portion and provided with a longitudinalslot therein, an embryotome comprising a knife having a shank swiveledin the slot of the head, a pivotal connection between the knife and itsshank, the main shank being adapted to engage the shank of theembryotome to hold the latter in position. a

In testimony whereof I affix my signature in presence of two witnesses.

HENRY M. STEVENSON. IL. 8.]

Witnesses:

ABRAHAM D. SAGER, FRED. C. HAMLIN.

